/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package cn.zch.test.netty.telnet;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

import java.net.InetAddress;
import java.util.Date;
/**
 * Handles a server-side channel.
 * @author zchcpywin10
 */
@Sharable
public class TelnetServerHandler extends SimpleChannelInboundHandler<String> {
  @Override
  public void channelActive(ChannelHandlerContext ctx) throws Exception {
    // Send greeting for a new connection.
    ctx.write("Welcome to " + InetAddress.getLocalHost().getHostName() + "!\r\n");
    ctx.write("It is " + new Date() + " now.\r\n");
    ctx.flush();
  }
  @Override
  public void channelRead0(ChannelHandlerContext ctx, String request) throws Exception {
    // Generate and write a response.
    String response;
    boolean close = false;
    if (request.isEmpty()) {
      response = "Please type something.\r\n";
    }
    else if ("bye".equals(request.toLowerCase())) {
      response = "Have a good day!\r\n";
      close = true;
    }
    else {
      response = "Did you say '" + request + "'?\r\n";
    }
    // We do not need to write a ChannelBuffer here.
    // We know the encoder inserted at TelnetPipelineFactory will do the conversion.
    ChannelFuture future = ctx.write(response);
    // Close the connection after sending 'Have a good day!'
    // if the client has sent 'bye'.
    if (close) {
      future.addListener(ChannelFutureListener.CLOSE);
    }
  }
  @Override
  public void channelReadComplete(ChannelHandlerContext ctx) {
    ctx.flush();
  }
  @Override
  public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
    cause.printStackTrace();
    ctx.close();
  }
}
